Selenium rectifier



ment Which is insInaed from the active e1ec tTode.

6. A Ineta1 rectiiier elennent com risin 8 base e1ecrode, a,n arctive electrode theTeon, said alctive electrode being substantiany coextensive With said bBSe electIode, ar counter electrode in contact th said alctive electTode, nd 1nens fol' insulalting al p0ron of said counter electrode 7. A neta1 rectine1 elenent accoTding to c1alin1 b 1 Wherein the insulBting yer coIn rises 9 coat- 5 ing of polystyrenel 

